An Autcannon anti-aircraft gun, also known as the ack-ack gun, is mounted at an unknown location as part of the civil defense protecting the Capital.
U.S. National Park Service
Anyone with additional information about the locations of the civil defense posts please contact the National Capital Museum Resource Center [MRCE] at mrce_admin@nps.gov
This digital asset is in the public domain. When publishing this asset for any use, including online, image must credit: National Capital Region Public Affairs Photo Collection, Photographer Abbie Rowe, NCRO 6